These are the so-called dot plots. Every few Fed meetings, the
various FOMC members are asked to make a forecast about the
future path of short-term interest rates. Then the guesses are
all put collectively on a chart that looks like this:

So you can see, that almost everyone expected rock-bottom rates
at the end of 2014. By 2015 the picture is more mixed, as almost
every FOMC member is predicting at least some kind of rate hike
by the end of the year. And one of them even thinks that interest
rates will be at 3% by the end of 2015. You don't know which FOMC
member is associated with each dot, but taken collectively, they
offer a signal of how they think things will advance going
forward.